Oblique Antiferromagnetism. I. A Phenomenological Approach

Autor:	Masukazu Igarashi, Kazukiyo Nagata
Rok vydání:	1992
Předmět:	Physics Paramagnetism Magnetization Condensed matter physics Magnetism Phase (matter) Phenomenological model General Physics and Astronomy Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Anisotropy Phase diagram
Zdroj:	Journal of the Physical Society of Japan. 61:2070-2080
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.61.2070
Popis:	A simple but useful phenomenological approach to the magnetism of a randomly mixed antiferromagnet B 1- x C x , in which a weak axial anisotropy of B-ions and a strong axial anisotropy of C-ions compete each other below a terminal concentration x s (≪1), is proposed. This approach is based on a two-sublattice model including angular variation of the sublattice magnetizations. The angular variation is induced by the local disarray of spin alignment and gives rise to the fourth-order anisotropy terms in the free energy. From this model, the concentration vs. external magnetic field ( x - H ) phase diagram for the random mixture is derived, which consists of four phases, namely, the paramagnetic phase, the antiferromagnetic phase, the field induced intermediate (or oblique antiferromagnetic:OAF) phase, and the spin flop phase. The magnetic resonance frequencies and the magnetization process are also derived.
Databáze:	OpenAIRE
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